<html>
<style>

#myChart1, #myChart2,#myChart3,#myChart4,#myChart5,#myChart6,
#barChart1, #barChart2,#barChart3,#barChart4,#barChart5,#barChart6
 {
	display: inline !important;
}

</style>
<body id="body" onload="loaded()">
<div>
<canvas id="myChart1" height="400px"></canvas>
<canvas id="myChart2" height="400px"></canvas>
<canvas id="myChart3" height="400px"></canvas>
<canvas id="myChart4" height="400px"></canvas>
<canvas id="myChart5" height="400px"></canvas>
<canvas id="myChart6" height="400px"></canvas>
</div>

<div>
<canvas id="barChart1" height="400px"></canvas>
<canvas id="barChart2" height="400px"></canvas>
<canvas id="barChart3" height="400px"></canvas>
<canvas id="barChart4" height="400px"></canvas>
<canvas id="barChart5" height="400px"></canvas>
<canvas id="barChart6" height="400px"></canvas>
</div>

</body>

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.js"></script>

<script>

function getBodyNode(){
	return document.getElementById("body");
}

function loaded(){
	var totalWidth = getBodyNode().clientWidth;
	console.log("width in load: " + totalWidth);

	var aCharts = document.getElementsByTagName("canvas");
	for( var i = 0; i < aCharts.length; i++){
		aCharts[i].width = totalWidth / 6.5;
	}

	var option = {
        tooltips: {
            enabled:false
        },
		type: "pie",
		xAxisData: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
		yAxisData: [12, 19, 3, 5, 2, 3],
		yAxisLabel: "Number of Votes"
	};

	for( var i = 1; i <= 6; i++ ){
		createChartOnCanvas("myChart" + i, option);
	}

    option.type = "bar";

    for( var i = 1; i <= 6; i++ ){
        createChartOnCanvas("barChart" + i, option);
    }
}

/*
	{
		type: pie,
		xAxisData: [],
		yAxisData: [],
		yAxisLabel: '# of Votes'
	}
*/
function createChartOnCanvas(canvasId, oChartOption){

	var ctx = document.getElementById(canvasId).getContext('2d');
	var myChart = new Chart(ctx, {
    	type: oChartOption.type,
    	data: {
        	labels: oChartOption.xAxisData,
        	datasets: [{
            	label: oChartOption.yAxisLabel,
            	data: oChartOption.yAxisData,
            	backgroundColor: [
                	'rgba(255, 99, 132, 0.2)', 'rgba(54, 162, 235, 0.2)', 'rgba(255, 206, 86, 0.2)', 'rgba(75, 192, 192, 0.2)',
                	'rgba(153, 102, 255, 0.2)', 'rgba(255, 159, 64, 0.2)'
            	],
            	borderColor: [
                	'rgba(255,99,132,1)', 'rgba(54, 162, 235, 1)', 'rgba(255, 206, 86, 1)', 'rgba(75, 192, 192, 1)',
                	'rgba(153, 102, 255, 1)', 'rgba(255, 159, 64, 1)'
            	],
            	borderWidth: 1
        	}]
    		},
    		options: {
    			responsive: false,
        		scales: {
            	yAxes: [{
                	ticks: {
                    	beginAtZero:true
                	}
            	}]
        	}
    	}
	});
}
</script>

</html>
